Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a81fc47fecfe4a6…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 06:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3b33742d4af5c22085ece3b5ef3e703f SHA-1: 19ad3e2bd00a9990aaf553b7741c080cec24f870 SHA-256: 9a81fc47fecfe4a6164f043d03769e4ec0e3935149846dcf095e8b27ef4636c2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are disposable or associated with redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=resnick+halliday+krane+physics+volume+2+solutions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481695/normal_600f470e87c74.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/2848831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_6027f45307287.pdfIn PDF document text
    • http://bofesota.66ghz.com/imap_path_prefix_email_android.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/92f5b5451e525e.pdfIn PDF document text
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/pasigu.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/8052305.pdfIn PDF document text
    • http://dashcamtopbest.com/merax_vibration_machine_walmartf3tcp.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/xiveduwutalopav-vusij.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/zazojosow.pdfIn PDF document text
    • http://all-system7.work/mupajapumegibubifogenawoc0jlf.pdfIn PDF document text
    • http://summ-ita.space/lulujozukewesajurinmhc0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixupod.rf.gd/agnathavasi_telugu_movie_tamilrockers.pdfIn PDF document text
    • http://fixowix.epizy.com/do_you_need_a_degree_to_join_the_military.pdfIn PDF document text
    • http://mezipep.rf.gd/how_to_connect_hp_deskjet_3755_to_wireless_network.pdfIn PDF document text
    • http://sedozod.rf.gd/nepalutodizej.pdfIn PDF document text
    • http://devoleresi.rf.gd/42159600484.pdfIn PDF document text
    • http://jufotafilowor.rf.gd/what_are_the_best_flowers_to_grow_for_bees.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D2 5676 bytes
SHA-256: 6de0ca27ba65fd192676d6d87ee630bfd23bf0a3075f6d1e1f1ea640d5b3682d
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 11152 bytes
SHA-256: 3f3cf85734678cf81994e40e20667b87007ede4a54ef18a73a739a3a58aa295e

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